Coil-spreading device



A. W. BJORKMAN con, SPREADING DEVICE Filed Jan. 1927 5 Sheets-Sheet 1 59.m N: @EnQ Q2 3 z E 3. 5 3 m2 Q L bmw 5 Y r 2 as n 3 Mm L :1 .5 g 1 TfiF a: N $9 Gm BY ATTORNEY R O 1 2 t at WV m M R o E a N s v 9 mm 3 mm mR. m n Q mfi m 1 MW a m a & R hm 2 a QM fi s Q R a% m M L n\/,% W E, v wm N mm A 8 M a A. W. BJORKMAN com SPREADING DEVICE Filed Jan. 4, 1.927

Aug. 14, 1928.

I ATTORNEY Aug. 14, 1928.

A. w. BJORKMAN VCOIL SPREADING vnvxc's Filed Jan. 4, 1927 5 Shand -Sheet4 M wuguam INVENTOR BY i ATTORNEY Aug. 14, 1928. 1,680,847

A. W. BJORKMAN COIL SPREADING DEVICE Filed Jan. 1927 5 Sheets-Sheet 5 Mwmgwlw INVENTOR BY ATTORNEY Patented Aug. 14, 1928.

UNITED STAT S PATENT OFFICE.

. B-TGRKMAN, or: BROOKLYN, NEN 32cm, ASSIGNOR r0 o'ri's ELEVATGR con-PANY, or NEW YORK, N. Y. A conrofsa'rion or New JERSEY.

ooIL-sPREADING DEVICE.

Application filed January 4, 1927. Serial No. 158,893.

This invention relates to coil spreading de vices and particularly todevices for spreading coils to be used for arn'iatur'es 0t dynamoelectric machines.

A feature of the invention is to provide moval of the coil from thedevice; a Other features and advantages Wlll become apparent from thespecification, taken in connection with the accompanying drawingswherein the invention is embodied in concrete form.

In the drawings Figure 1 is a front elevation of the coil spreadingdevice with a coil mounted thereon preparatory to spreading;

Figure 2 is a side elevation of the coil spreading device, with, partsbroken away, and illustrates the form taken by the 001 after spreading;V

Figure 3 is a plan view of Figure 2;

Figure at is a View taken along the line 1f t of Figure 1;

Figure 5 is a sectional View taken along the line 5- 5 of Figure 4; V 1

Figure 6 is a sectional view taken along the line 6-6 of Figure '1;

Figure 7 is a sectional view taken along the line 7-7 of Figure 1;

Figure 8 is a view taken along the line S8 of Figure 2; a

Figure 9 is a sectional view taken the line 9--9 of Figure 8;

Figure 10 is a sectional view taken the line 10-10 of Figure 8; Y

Figure 11 is a sectional view taken the line 1.111 of Figure 8; a

Figure 12 is a view similar to Figure 1 and illustrates the coilspreading device preparatory to spreading a closed type of coil; p

Figure 13 is a plan view of the coil spreading device with parts brokenaway and ilalong along along lustrates the form taken by the closed type01 coil after spreading; and

s Figure 14 is a sectional view taken along the line 1114 of Figure 12;

Reference may first be had toFigures 1 and 2 illustrating the device asa whole wherein, according to the preferred arrangement; a bench 1 isprovided to support the coil spreading machine. A bracket 2 is securedto the underside of the bench 1. The bracket 2 is formed with twodownwardly extending spaced lugs 4 and 5. Lugs 4 and 5 are provided withaligned cylindrical apertures and a pin 6 extends through theseapertures and is retained in them as by (otter pins. 'A h1g7 is'formedon a cyl' inder end cover 8 and this lug extends between lugs 1 and 5 onthe bracket 2. Pin

6 extends through an aperture in lug 7 and acts as a pivotal, supportfor one end of a pneumatic cylinder 10. Pneumatic cylinder 10 comprisesthe end cover 8, a tubular portion 11, and a head 12. Three tie rods 13extend through apertures in the end cover 8 and through similarapertures in the head 12. Nuts 14 on the end of the tie rods serve tosecure the end cover 8 and head 12 to the tubularportion 11. lVash'ers15 of fibrous material are positioned between the tubular portion 11 andparts 8 and 12 in order to obtain air-tight joints between the tubularportion 11 and these parts. A nut 24 is threaded on the piston rod 23adjacent one side of the piston 16 and urges the piston against theheaded end 25 of the piston rod, thereby holding the several parts ofthe piston together. The piston rod 23 extends through an aperture 26 inthe head 12. A packing nut 27 is threaded into the aperture 26 and bearsagainst a packing Washer 28 surrounding the piston rod 23, The outer endof the piston rod is threaded "and connected by a turnbuckle 3O tothethreaded end of a connecting rod 31; gThe thread on the connecting rodis opposite to that on the outer end of the piston rod. The other end ofthe connecting rod is flat and is pivotally mounted on a pin 32 car'-riedby the lower biturcatedend of'an operating, lever Operating lever 33is pivotally mounted on a stationary shaft 34. Frointhe shaft 34 thelever 33 extends up wardly and has a flat enlarged upper end portion 35.In the event that the device is to be used to spread open type coils, i.e. thosewherein the sides of the coil form a loop at only one end, thena movable former 36 is secured to the end portion of the operating leverby screws 37 extending through apertures in the end portion 35 andthreaded into the movable former 36. The movable former 36 comprisesabody portion 38 having a ledge 39 extending therefrom and a fan shapedforming portion 40. The upper surface 47 of the fan shaped formingportion-40 is curved. The center of curvature of the surface 47 lies inthe plane of a clamping face 48 of the body portion 38. The body portion38 has two hinge lugs 41 and 42 extending upwardly therefrom. Lugs 41and '42 are provided with aligned apertures. A hinge pin 43 extendsthrough similar apertures in lugs 44 and 45. formed on a hinge clamp 46.The hinge clamp 46v comprises a body portion 50 and an offset guideportion 51. The lower surface of the offset guide portion 51 is curvedand this surface conforms to the curvature of the upper surface 47 ofthe fan shaped forming portionv of the former 36. With the hinge clamp46' in the position shown in Figure 2; the lower surface of the guideportion 51 rests upon the upper surface 47 of the former, 36. The bodyportion 50 of the hinge clamp is rabbeted at 52 thereby providing arecessed clamping face 53 extending parallel to the clamping face 48 ofthe former 36. Th s body portion is formed with two recesses 54 and55111211] are in alignment with similarrecesses 56 and 57 provided inthe body portion of the former 36.

- An eye-bolt 58 is pivotally mounted on a pin (iii 60 carried by lugs61 formed in the body portion of the former. The shank 62 of theeye-bolt 58 extends through the recesses 54 and 56 and has a star nut 63threaded on its outer end. Similarly, an eye-bolt 64 is pivotallymounted on a pin 65 and is carried by lugs 66 formed on the body portionof the former. The shank 67 of the eyebolt 64 extends through therecesses 55 and 57 and has a star nut 68 threaded on its outer end. Thestar nuts 63 and 68 engage a side of the body portion 50 of the hingeclamp. A handle, has a reduced end 73 threaded into the body portion 50of the hingeelamp. a

A lug 70 extends from one end of the ledge 39 of former 36. Lug 70 hasahushed bearing aperture 71 extending therethrough. vA pivot bolt 72 hasa reduced lower end portion 74 positioned within the bearing aperture71.- The end of this reduced end portion is beveled at 75so as'to permitthe ready insertion of the end portion 74 into the bearing aperture 71.The pivot bolt 72 also has a reduced upper portion 7 6' that extendsthrough an aperture in a handle 77.

operate A nut 78 is threaded on the outer end of the portion 76 adjacentthe handle 77 and secures the handle 77 to the pivot bolt 72. A bolt 80has a reduced portion extending through an aperture in the handle 77. Anut 81, threaded on the end of this reduced portion, secures the bolt 80to the handle 77. A roller 82 is rotatably mounted on the bolt 80. Astop member 83 is positioned adjacent the bearing aperture 71 and issecured to the lug 70 by screws 84.

A stationary former 85 is arranged to co- With the movable former 36.Former 85 comprises a body portion 86 having a ledge 87 extendingtherefrom and a fan shaped forming portion 88. The upper surface of thefan shaped forming A portion 88 is curved. The curvature of the surface90 is similar to the curvature of surface 47 of the'movable former 36. Aguide flange 91 is formed on the forming portion 88. Flange 91 is acontinuation of the body portion 86.

The ledge 87 has an aperture 92 of circular cross section extendingtherethrough. A portion of the aperture 92 is of greater diameter thanthe remaining portion. A clamp stud -93 extendsinto the portion of theaperture 92 that is of greater diameter and has a reduced shank 94 thatextends through the portion of aperture 92 that is of lesser diameter. Acompression spring 95 surrounds the shank 94 within the aperture 92 andbears at one end against the clamp stud 93 and at the other end againsta shoulder formed in the ledge 87 by the portion of aperture 92 that isof lesser diameter. The outer end portion of shank 94 is flattened andhas a transverse aperture 99 extending therethrough. A pivotal pin 96extends through aperture 99 and through aligned apertures in thebifurcated end part 101 of a releasing lever 97. A washer 98 ispositioned on the flattened end portion of shank 94 between theunderside of ledge 87 and part 101 of the releasing lever 97. Thedistance between a side 100 of the end part 101 and the pivotal pin 96is less than the distance between the end 102 of end part 101 and thispivotal pin. The surface of the end part 101 joining the side 100 andthe end 102 is curved, and constitutes a part of a cam surface com'nfising the side 100, the curved surface and the end 102. The spring 95causes the end part 101 of the releasing lever to bear against thewasher 98. A clamping lug 103'is formed on the upper end of the clampstud 93: 1 I

A lug 104 is formed on the end of the ledge 87. A pivotal stud 105 has areduced portion extending through an aperture in the lug 104 and throughan aperture 109 in a bending block 106. A washer 107 is secured to theend of the reduced portion of the pivotal stud 105 by a screw 108. Thisby screws 117.

moons retains this portion of the stud within the aperture 111. A roller11a is rotatably mounted on the roller stud 110. A handle 114 has areduced end threaded intoa recess 115 provided the bending block 106. Astop member 116 secured to the lug 101 The body port-ion 86 of thestationary former has a downwardly extending flange 118 that providedwith four apertures.

Screws 120extend'through these apertures,

and are threaded into a supporting bracket 121, thereby securing thestationary former to this supporting bracket. Supporting bracket 121 ismounted on the bench 1 and is secured to this bench by bolts extendingthrough aligned apertures provided in the sup orting bracket, the benchand a sub-brac 'et 123. The sub-bracket is also directly secured to thesupporting bracket by bolts 124. Two similar lugs1'25 and 126 are formedon the upper end of the supporting bracket 121. Glampscrews 127 and 128are threadedthrough apertures in the lugs and 126 and have reduced endportions that extend into clamp blocks 130 and Pins 132 and 133 extendthrough apertures in the clamp blocks130 and 131 and are positionedwithin annular grooves 131 and provide'din'the reduced end portions ofthe clamp screws, thereby retaining the clamp blocks on the reduced endportions of the clamp screws. By turning the star heads of these clampscrews,- the clamp blocks may be moved towards or awa from the bodyportion 86 ofthe stationary 'ormer.

Supporting bracket 121 is formed with downwardly extendingsupportinglugs 136 and 137. Stationary shaft 34 extends through alignedapertures in lugs 136 and 137 and has its ends supported in brackets 138and 140 secured to the bench '1. 3 Set screws 141 are threadedthroughthe walls of the lugs136 and 137 and engage the shaft 34, thus retainingthis shaft in fixed position. A stop 139' is formed on the bracket 121and arranged to be engaged by the operating lever 33;

A clamp lever 129 is pivotallyfmounted on the shaft 34'and ispositionedadjaeent the bracket 121. Atension spring 1419 has one endsecuredby an eye-boltto the. clamp lever 129 and its other end likewisesecured to: the bracket 140. Spring 14-9 tends to retain the hub ofclamp lever 129 in engagement with astop collar 142 secured on the shaft34 by a screw 143. A'similar tension spring 144 has one end secured byan eye-.

bolt to the chimp. lever and its other end secured to ohe underside ofthe bench 1.

tending T slot 153 provided therein.

Spring 11 1 tends to retain the clamp lever in a vertical positionand inengagement with the bench 1.

'ccss 148 and bears at one end against the bot-tom of this recess andatits other end against a plug 151 threaded into the clamp sleeve 145.Spring 150 supports the weight of clamp sleeve 145 together with that ofan end clamp 152 carried by this sleeve, so that the plug 151 is spacedfrom the upper end of the clamp lever. The upper end of the clamp sleevehas a transversely ex- The bottom of this slot has a groove 154; thatextends for the greater portion of the length ofthis slot.

End clamp 152 comprises a stationary j aw and a movable jaw 156. Thelower portion of these jaws are T-shaped and are positioned within the Tslot 153 pro vided in the clamp sleeve145. Stationary jaw 155 is securedto the clamp sleeve by a 7 screw 157 extending through an aperture inthe jaw 155 and threaded into the clamp sleeve. A handle 158 has areduced end threaded into an aperture in the movable jaw 156. A stopscrew 160 is threaded into the lower end of the movable jaw 156 and hasits head extending into the groove 151.

A' sleeve 161 is adjustably threaded into an aperture 162 provided inthe stationary jaw 155. A look nut 163, threaded on the sic-eve 161 andbearing against the jaw 155, retains the sleeve 161' in its adjustedposition in.

aperture in t-lie'end of the shank 167. The

bifurcated end portion of the releasing lever hasthe form-of a cam. Thedistance be tween the end 168 of this bifurcated end portion and thepivotal pin is greater than the distance betweenthe side 170 of this endportion and the ivotal pin 165.

The shank 167 of the F bolt also extends through an elongated aperture171 provided in the'rnovable jaw 156. The head of the T bolt 16% extendsacross the aperture 1 and abuts the side of the jaw 156. The aperture171.confor1ns to the shape ofthe head of the T bolt 161. A positioningpin 172 has a shank 173 extending through aligned apertures 159 and 169in the clamp jaws 156 and 155. A coil stop bracket 179 Joe is adjustablysecured by screws to the jaw 155 and has a flange 189 extending parallelto the'positioning pin 172. An I-bolt 174 has its head positioned withina slot 175 provided in the stationary'jaw 155. The head of the I-bolt174 is pivotally mounted on a pin 176 that extends through the jaw 155and through the eye of the I-bolt. The shank of the I-bolt 174 rests ina slot 178 provided in the movable jaw 156. I A star nut 180 is threadedon the shank of the.

I-bolt 174 and engages the side of the movable jaw 156.

Acompressed air valve181 is mounted on a bracket .182 carried by thebench 1. An inlet pipe 183 co1mectsthe valve 181 to a source ofcompressed air. The valve 181 has a pipe 184 connected by a flexiblehose 186 to piping threaded into a port formed in the end cover 8. Theport in the end cover 8 extends tothe inside of pneumatic cylinder 10 tothe space in this cylinder under the piston 16. The valve also has apipe 185 connected by a flexible hose 187 to piping threaded into a portformed in the head 12. The port in the head 12 extends to the inside ofthe pneumatic cylinder 10 to the space in cylinder 10 above the piston16; The valve is also provided with an exhaust pipe 177.

The valve 181' is controlled by a handle 188. hen handle 188 is in theposition that causes the inlet pipe 183 to be connected to the pipe 184,then the pipe 185is connected to the exhaust pipe 177. Likewise when thehandle 188 is in the position that causes the inlet pipe 183 to beconnected to the pipe 185, then the pipe 184 is connected to the exhaustpipe-177.

' The operation of the coil spreading device is illustrated in. Figures1, 2 and 3. Preliminary to placing the coil in the spreading device, thehandle ,188 of the valve 18 1 is positioned so that the inlet pipe 183is connected to the pipe 185 With handle 188 in this position the piston16 is at the inner end of its stroke and the spreading devieeis in itsspread position, the movable tormer 36 being spaced away fromv thestationary former 85 as shown in Figure 2. The hinge clamp 46 is placedin its inoperative position upon the top of the movable former 36 withthe body portion 50 disengaged from the clamping face 48 of the movableformer. In this position of the hinge clamp the I-bolts58 and 64 hangdown from their pivot pins and 65 and do not engage the recessesprovided for them in former 36 and in hinge. clamp 46.

The clamp blocks.130; and 131 and the clamping lug 103 onthe clamp stud93 are positioned so as to permit: the insertion of one side of theicoilbetween these members and the body portion 86 of the stationary former.The movable jaw 1560f the end clamp 152 is spaced from the stationaryjaw 155, so as to permit the insertion of the closed end of the coilbetween these jaws.

In carrying out the spreadin operation, one side of the coil to bespread is inserted between the body portion 86 and the clamp blocks 130,131 and stud 93. This side of the coilis permitted to rest on the ledge87 while the closed end of the coil is placed be tween the jaws 156 and155 of the end clamp 152 so that the end of this coil abuts the stopbracket 179. The end of the positioning pin 172 is then passed throughaperture 159 in the jaw 156, through the coil and through aperture 169in the jaw 155. The eye-bolt 174 is swung aboutits pivot pin 176 so asto cause its shank to enter the slot 178 provided in the movable jaw156. Star nut 180 is turned to cause the jaws of the end clamp to gripthe end of the coil. The head of the T bolt 164 is passed throughaperture 171 in the jaw 156 and then turned one-fourth of a revolutionso as toengage the jaw 156 on opposite sides of the aperture 171.Releasing lever 166 is then turned from an upright to a horizontalposition so as to cause its end 168 to engage the end of the sleeve 161.This movement of the releasing lever 166 causes the j aws 155 and 156 tofurther grip the end of the coil. The clamp stud 93 is turned by meansofthe releasing lever 97 so that the clamping lug 103 extends over theside of the coil thatrests on the ledge 87. The releasing lever 97 isthen turned about its pivotal pin 96 from a horizontal to a verticalposition, thereby causing the clamping lug to move down and firmly pressthe side of the coil against the ledge 87 without injuring the coils.The clamp screws 127 and 128 are turned so that the clamp blocks 130 and131 engage this side of the coil and clamp it against the body portion86 of the stationary former. These clamp blocks exert a powerful forceagainstthe side of the coil and prevent its slipping during thespreadingoperation without injuring the coil or its insulation.

The handle 188 of valve 181 is now turned so that inlet pipe 183 isconnected to the pipe 184, thereby causing compressed air to beadmittedto. the space in cylinder 10 under the piston 16, The pistonmoves outwardly while the a air above the piston escapes throughthe'exhaust pipe-177. The outward movement of the piston causcstheoperating lever 33 to turn about the shaft 34, thereby moving themovable former 36 towards the stationary'former 85. The movement of theoperating lever 33'is finally checked by its engagement, with the stop139. In this position of the operating lever the upperside of the coilrests on the ledge 39. of. the movable former 36. The hinge clamp: 46 isthen turned about its hinge pin 43 by means of,

handle 69 so that the upper side of the coil is positionedbetweenytheclamping face 48 of the former 36 andthe recessed clampingface 53 of the hinge clamp 46. Eye-bolts 58 and 6.4 are then turnedabout their pivot pins so that their shanksu enter therecesses providedfor them in, the movable former nd h nge amp- Star nuts 63 and 68V areturned seas, to cause the upper side of the coil tobe gripped firmlybetween the former 36 and the hinge clamp.

Handle 77 isiplaced over the upper side of the coilso that theendportion 74 of the pivot bolt 72 enters the'aperture 7 1 in the heoperator now turns the handle 188 of.

valve 181 so as to cause piston 16 to move inwardly of' cylinder 10 andthereby bring aboutthe spreading ope-ration. As the mor able formermoves away from the stationary former the lower side of thecoilislidesover the upper surface 90 of the. fan" shaped forming portion 88. of.the stationary former, while the u .perside of thecoil slides" over theupper sur ace li'. of the fan shaped 4 forming" portion 40 ofthemovableformer.

The lower sidelofi the ootlbends around and takesthe shape-,otthe guideflange 91, whilethe upper side of the coilbends aroundand takes theshape of thaoflset guideportion 1 51 of the hinge clamp 46. Duringthismove merit of the movable former the end of the coil moves outwardlyof thebenc'hi 1 and, by overcoming the. tension of springs 1 145 and149. causes the clamp lever 129' to swing about the shaft 34 and at thesame time slide along this shaft thus moving away from the stop collar142.

to spread closed type coils, i. e. those wherein the sides of the coilform-a loop at both ends then formers having fan shaped forming portionsat both ends of their body portions are employed, asitlustrated inFigures 12 and 13, The fun shaped forming portions 192 and 193 of themovable former The spreading operation ends with the piston 16 in. en"gfcinent with."

194 are. of the same construction and: their upper surfaces 190 and 191have the same curvature and lie in a common cylindrical surface. Thehinge clamp 195 is similar to the hinge clamp 46 with the exception thatclamp 195 has two offset guide portions 196 and 19,7 conforming to thecurvature of the surfaces 190 and 191.

The fan shaped forming portion 198 of the stationary former 20.0 issimilar in construction to that of the forming portion 88 of thestationary former 85. The fan shaped forming portion 201 of the former200 is of somewhat different construction, however, since the end of thecoil formed on this forming portion is composed of a singleturn whereasthe opposite end of the.

coil has two turns. Inasmuch as forming portion 201 accommodates but asingle turn of the coil, the upper face 202 of this forming portion liesin acylindrical surface that is higher than the cylindrical surface ofthe upper "face 203 of forming portion 198. The lodge 19.9 of thestationary former 200 extends the entire length of the forming portion201 forming a shoulder at 204. A

chimp, stud 205 extends through an aperture 206 provided in ledge 199-and has a releasing lever 207 pivoted on its lower end. This clamp studand its associated parts are of the same construction as clamp stud 93and its associated parts. An: additional clamp stud 208 extends throughan aperture 210 provided in the ledge 199. Clamp stud 2081s siinila-rtoclamp. stud 205 with the exception that the former has a shank 211 thatlonger than the shank of clamp stud 205. Shank 211 extends through abushing 212 that is threaded into aperture 210; A handle 213 ispivotally-mounted on thebushing 212. Handle 213 has an aperture throughwhich extends the reduced shank. 215 of a block 216. of shank 215.retainsv the block 216 011 the handle 213. Block 216 extends through acurved aperture 217 1)1'ovidedin the stationary former. Handle 213 andblock 216 perform the function of bending one coil lead of the doubleloop coil just as handle 114 and roller 113 perform the function ofbending one coil lead of the single loop coil. Clamp studs 208 and 205press one side of thecoil to be spread against the ledge 199. Clampscrews 21 1 and 2.18 and clamp blocks 220 and 221 perform the samefunction for the double loop or closed type coil that clamp screws 12Tand 12-8 and clamp blocks 130 and 131 perform for the single loop oropen type coil.

Two end clamps are employed in spreading the closed type of coil. Endclamp 222 isof the same construction as and clamp 152 and therefore isbelieved to require no further description. This clamp grips-the end ofthe 0011 that is composed of a single turn.

A nut on. the end lllll,

End clamp 223 grips theend of the coil that is composedof two turns;Instead of using a single positioning pin forsupporting the end of thecoil, this clamp has two positioning pins 224 and 225. Positioningpins224 and 225 are axially offset and are adjustably threaded into thestationary and movable clamp jaws of the end clamp. Loclrnuts 226 and227 secure these pins in position. In mounting the coil in the spreadingdevice one turn is positioned on one of the positioning pins while theother turn is positioned on the other positioning 1 In spreading thecoil the upper leads of the two turns are secured by the hinge clamp 195to the movable former .194 whereas the lower leads of the two turns aresecured by clamp studs 208 and 205 and clamp blocks 220 and 221 to thestationary former 200.

It is to be noted that the amount that the coils are spread may bevaried by adjusting the1 turnbuckle 30 connected to the piston I'OCOwing to the positive gripping of the sides of the coil during thespreading operation, there is no slipping of the coil during thisoperation with the result that accurately formed coils are produced;

Owing to the smooth and extensive gripping faces of the various clamps,neither the coil nor its insulation is injured during the spreadingoperation.

It is to be noted that by merely changing the type of formers employedan unlimited variety and sizes of coils may be spread.

As many changes could-be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrativeand not in a limiting sense.

lVhat is claimed is:

1. A coil spreading device comprising, means for gripping thesides ofthe coil to be spread, means for gripping an end of the coil to bespread, templates for the portions of the coil between said sides andsaid end, and operatin means, said operating means causing the rst namedgripping means to spread the coil to the form of the templates, whilethe second named gripping means operates to permit the spreading of thecoil.

2. A coil spreading device comprising, a movable former, a clamp forsecuring one side of the coil to be spread to said movable former, astationary former, clamping means for securing the other side of thecoilto said stationary former, a movable end clamp for gripping an end ofthe coil, and operating means, said operating means causing said movable.former to be moved so as to spread the coil and thereby effect movementof the end clam I 3. A coll spreading device comprising, a movableformer, a clamp for securing one side of the coil-to be spread to saidmovable former, means carried by said movable form-- or for bending alead of the coil, a stationmy former, clamping mean for securing theother side of the coil to said stationary former, means carried by saidstationary former for bending another lead of the coil, and operatingmeans, said operating means causing said movable former to be moved soas to spread the coil. i

4.. A coil spreading device comprising, a movable former, a clamp forsecuring one side of the coil to be spread to said movable former,removable means carried by said" movable former for bending a lead ofthe coil, a stationary former, clamping means for securing the otherside of the coil to said stationary former, means carried by saidstationary former for bending another led of the coil, a movable .endclamp 'for gripping an end of the coil, and operating means, saidoperating means c'ausing said movable former to move so as to spread thecoil and simultaneously causing movement of the end clamp. 1

5. A coil spreading device comprising, a movable former, a clamp forsecuring one side of the coil to be spreadto said movable former,removable means carried by said movable former for bending a lead of thecoil, a stationary former, clamping means for securing the other side ofthe coil to said stationary former, means carried by said stationaryformer for hendinganother lead of the coil, movable end clamps forgripping the ends of thecoil, and motive means, said. inotive meanscausing said movable former to move so as to spread the coil and thereby'eflect movement ofthe end clamps.

6. A device for spreading coils comprising, motive means. a movableformer, a. clamp associated with the movable former and arranged to gripa side of the coil to be spread and to act as a guide for a portion ofan end of the coil, a stationary former, clamp blocks associated withthe stationary former andarranged to grip the other side of the coil tobe spread, and a clamp stud associated with the stationary former andarranged to grip said other side of the coil, said movable former beingoperated by the motive means to cause the coil to be spread into theform of an armature coil that may be withdrawn from the device upon therelease of the clamp, the clamp blocks and the clamp stud.

name to this specification.

1 AXEL W. BJORKMAN.

In testimony whereof, I have signed my

